St Nicholas Church of EnglandPrimary Academy

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# Maths

## Place Value (within 20)

Our first unit of this term is 'Place Value within 20' where we will learn that two digit numbers are made up of tens and ones.  We will expand our number range to 20 and learn to build numbers using base 10 equipment.  We will then find one more and one less, compare numbers using greater than, less than and equal to and order numbers within 20.

## Vocabulary

Teen numbers, tens, ones, compare, greater than, less than, equal to,

## Addition and subtraction within 20

### Vocabulary

Following on from our unit 'place value within 20', we will be looking at adding and subtracting numbers within 20. We will continue to add by counting on and we will learn that it is more efficient to start from the largest number when adding. For example, for the sum 2 + 14 = we would start from 14 and add on 2.  We will also use our knowledge of number bond facts within 10 to help us with addition and subtraction within 20. This term, we will introduce subtraction where we have to cross ten.  We will use concrete manipulatives to support the children's understanding of subtraction and finding the difference. Towards the end of our unit we will look at fact families within 20 where children will learn that addition and subtraction are inverse operations.

### Number bonds

The children will use previous knowledge of number bonds to support them when adding and subtracting within 20.  For example, if they know that 4 and 2 are a bond to 6, they can use this fact to see that 14 and 2 are a bond to 16, as are 4 and 12.

If they know that 8 - 3 = 5 then they can use this fact to work out 18 - 3.

### Strategies

We will use strategies learnt last term when adding and subtracting within 10.

The children will continue to use concrete resources such as cubes and counters as well as using number lines, tens frames and base ten equipment. We will also use counting on and counting backwards and the children will learn that when adding it is more efficient to start with the biggest number in the sum.

Here is one example of using a number line.

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